Mr. Allen a 19-year-old college student, was rock climbing when he fell 30 feet to the ground.  Paramedics arriving at the scene found him lying in the supine position, unable to move his extremities and complaining of neck pain and reported loss of sensation in both his upper and lower limbs.  He is awake, alert and oriented to place, person and time.  He can provide details about the fall.  On assessment, his pupils were equal and reactive to light.  He has no visible head injuries, apart from minor abrasions on his arms.  His vital signs:  BP 110/72 mmHg, RR 18 bpm, HR 82 b/m, SpO2 95% on room air.  The paramedics suspected him of having a spinal cord injury.   Which of the following is a primary mechanism of spinal cord injury that may have occurred in Mr. Allen’s fall? 多项选择题

A

Compression of the spinal cord due to direct trauma

B

Musculoskeletal injury without neurological involvement

C

Concussion caused by the head hitting the ground

D

Peripheral nerve injury to the arms and legs

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